Hewitt, D.

Effect of ozone on modern clover cultivars

Data includes impacts on root nodule biomass, stomatal conductance, injury rates, and N-fixation in the white clover cultivar (T. repens cv. crusader). An ozone-exposure experiment was conducted in solardomes during the spring and summer of year 2012 on modern clover (Trifolium spp.) cultivars. The effects of ozone pollution (30, 35, 40, 45, 52, 67 parts per billion (ppb) treatment means) on the growth and functioning of the clover cultivars was investigated. Both cultivars had positive increases in ozone-injury rates, although stomatal conductance was unaffected by ozone exposure. Reductions in root nodule biomass and nodule number occurred in white clover, and red clover displayed an increase in nodule density. Nitrogen fixation rates were suppressed in white clover, which could have important implications for the sustainability of managed pasture. The work was carried out as part of a NERC funded PhD. Project number NEC04456.

Publication date: 2017-04-21

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This dataset is made available under the terms of the Open Government Licence

Format of the data: Comma-separated values (CSV)

You must cite: Hewitt, D. (2017). Effect of ozone on modern clover cultivars. NERC Environmental Information Data Centre. https://doi.org/10.5285/b63fbb6c-5030-43a1-b0ea-160bb5a83078


© UK Centre for Ecology & Hydrology


Study area
Temporal extent
2012-07-11    to    2012-10-03

Provenance & quality

White clover (Trifolium repens cv. Crusader) and red clover (Trifolium pratense cv. Merviot) were exposed to elevated ozone (mean concentrations 30, 35, 40, 45, 52, 67 parts per billion (ppb)) in solardomes for a period of 12 weeks in the early summer of year 2012. Data was first recorded in the field in field notebooks, and was then transferred to electronic copies (MS Excel worksheets). Data was then exported as .csv files for ingestion into the Environmental Information Data Centre.

Correspondence/contact details

Mills, G.
UK Centre for Ecology & Hydrology
Hewitt, D.
UK Centre for Ecology & Hydrology


Hewitt, D.
Centre for Ecology & Hydrology

Other contacts

NERC Environmental Information Data Centre
Rights Holder
UK Centre for Ecology & Hydrology

Additional metadata

Topic categories
Abergwyngregyn Cultivar,  Environmental risk Ozone,  Pollution Seedlings,  Soladome,  Solar Dome
Environmental Monitoring Facilities
Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid
Last updated
20 May 2022 10:19